#ifndef __UDP_SERVER_HPP__
#define __UDP_SERVER_HPP__

#include <iostream>
#include <string>
#include <memory>
#include <cstring>
#include <cerrno>
#include <strings.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <functional>

#include "IntAddr.hpp"
#include "Log.hpp"
#include "Common.hpp"
#include "ThreadPool.hpp"

using namespace LogModule;
using namespace ThreadPoolModule;

using namespace LogModule;
using namespace ThreadPoolModule;

const static int gsockfd = -1;
const static uint16_t gdefaultport = 8080;

using adduser_t = std::function<void(InetAddr &id)>;
using remove_t = std::function<void(InetAddr &id)>;
using task_t = std::function<void()>;
using route_t = std::function<void(int sockfd, const std::string &mssage)>;

class nocopy
{
public:
    nocopy(){}
    nocopy(const nocopy&) = delete;
    const nocopy& operator=(const nocopy&) = delete;
    ~nocopy(){}
};

class UdpServer : public nocopy
{
public:
    UdpServer(uint16_t port = gdefaultport)
        : _sockfd(gsockfd)
        , _addr(port)
        , _isrunning(false)
        {}
    void InitServer()
    {
        //1.创建套接字
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0); 
        if(_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket: " << strerror(errno);
            Die(SOCKET_ERR);
        }
        LOG(LogLevel::INFO) << "socket success, sockfd is : " << _sockfd;

        // 2.2 bind ： 设置进入内核中
        int n = ::bind(_sockfd, _addr.Netaddr(), _addr.NetAddrlen());
        if (n < 0)
        {
            LOG(LogLevel::FATAL) << "bind: " << strerror(errno);
            Die(BIND_ERR);
        }
        LOG(LogLevel::INFO) << "bind success";
    }

    //设置添加 删除 路由任务
    void RegisterService(adduser_t adduser, route_t route, remove_t removeuser)
    {
        _adduser = adduser;
        _route = route;
        _removeuser = removeuser;
    }
    void Start()
    {
        _isrunning = true;
        while(true)
        {
            char inbuffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);

            ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer) - 1, 0, CONV(&peer), &len);
            if(n > 0)
            {
                InetAddr cli(peer); 
                inbuffer[n] = 0;
                std::string message;
                if(strcmp(inbuffer, "QUIT") == 0)
                {
                    //说明用户想退出了, 此时移除
                    _removeuser(cli);
                    message = cli.Addr() + "#" + "我走了, 你们聊!";
                }
                else
                {
                    _adduser(cli);
                    message = cli.Addr() + "#" + inbuffer;
                }
                //3.构建转发任务, 推送给线程池, 让线程池进行转发
                task_t task = std::bind(UdpServer::_route, _sockfd, message);
                ThreadPool<task_t>::getInstance()->Equeue(task);
            }
        }
        _isrunning = false;
    }
    ~UdpServer()
    {
        if(_sockfd > gsockfd)
            ::close(_sockfd);
    }
private:
    int _sockfd;
    InetAddr _addr;
    bool _isrunning; //服务器运行状态

    //新增用户
    adduser_t _adduser;
    //移除用户
    remove_t _removeuser;
    //数据转发
    route_t _route;
};

#endif